Internal-combustion-engine valve



Nov. 3, 1925.

W. HARPER, JR

INTERNAL COMBUSTION ENGINE VALVE Original Filed May 12 1919 Patented Nov. 3, 1925.

UNITED STATES.

PATENT orifice,l

WILLIAM HARPER, JR., 0F NEW BLOOMFIELD, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 GAS TURBINE CORPORATION, OF NEW YORK, N. Y., A CORPORA- TION 0F DELAWARE.

INTERNAL-COMBUSTION-ENGINE VALVE.

Original application med May 12, 1919, Serial No. 296,358. Divided and this application led December To all whom it may concern:

Be it known that I, WILLIAM HARPER, J r., citizen of the United States, and residentoof New Bloomfield, in the county of Perry and State of Pennsylvania, have invented certain new and useful Improvements in Internal- Combustion-Engine Valves, of which the following is a specilication.

This invention relates to internal combustion engine valves, and more particularly to exhaust valves of the usual poppet type. Such valves must be opened by a positively actuated means against a pressure considerably in excess of atmospheric.

I have devised an exhaust valve and aetuating means therefor, whereby the initial movement of the valve against the pressure within the cylinder is relatively slow, but as soon as the valvevis lifted from its seat, the movement becomes more rapid. The valve itself is so Iformed, in conjunction with the valveseat, as to produce an ejector-like ac- '.tion, thus facilitating escape of the exhaust gas. A guide is provided to insure proper seating of the valtfe, and special means are employed to prevent the transmission into .the valve of side thrust from the actuating means. The invention herein set forth is applicable to engines of the rotating cylinder type as well as to engines having stationary cylinders.

With these and other objects'in view, l have devised the apparatus described in the following specification and illustrated in ythe accompanying drawing, of which inder 2 may be provided with the usual car.-v

bureter in t pipe and inlet valve (not shown), or if a rotating cylinder, fuel may Serial No. 520,911.

be su plied from the crank case lthrough a valve in the piston ,(not shown). In either' case the exhaust valve and associated features will be the same.

The exhaust valve is provided with a curved periphery-51, instead of the usual conical periphery, seating on the conical valve seat 52 provided on the ring 53 for creating an ejector action in the initial exhaust. The ring 53 seats on top of the cylinder head and is held b clamping ring 54:. The ring 53 is provide with gas ports .55 and lugs 56, 57 land a valve stem bushingy retainer or guideway 58. 59 is the valve stem, which is made hollow. to receive a ball-end tapered valve actuating rod 60, which is engaged by the end of a lever 61 pivoted at 62 in lug 57, 63 being a counterweight. Theball-ended actuating rod is pivotally connected to the valve at a point nearthe valve head, thereby insuring that there will be no appreciable side thrust-on the valve. The valve 50 is kept seated by a double coil spring,64,.-having one end straddling the lug 56 and the other end engaging a shouldered ring 65 mounted on valve stem" bushing 58. The ring 65 is held on the valve stem bushing by a split ring 67, restingiin the groove in the upper endl of bushing 58 Aand held there bythe ring 65 underthe tension of spring- 64. Mounted in the lug 56 at 68 is an actuating rocker 69 carrying an actuating pin 70 and actuating end 71, operat-ingz;v in succession on lever 61. The pin 70 first engages the lever 61, and hence causes the exhaust valve to be opened at an increased'leverage but lower speed, as compared with the engagement of end 71 with lever 6.1. The purpose of thisis to provide an exhaust lvalve opened at a varying leverage and rate, being initially opened at thel 'time of maximum pressure against ashort leverage,'and the leverage increasing as soon as the initial pressure has partially exhaustp hood 75 is provided toaid in the exhaust' which is given an increased opening owinco to the variable leverage. The lever 69 1s connected `by link 73 with a push rod 74,

'which is operated by a' fixed cam in the usual manner.

In engines'of the rotating cylinder type, a

ofthe gases, this hood opening on one side in the direction in which the cylinder is rotating so as to take in air and cause it to edge and the valveseatand then expand on the other side, similar to an ejector. The

A resistance of the escaping gases is veryanuch diminished, and the pressure building up on the outside of the valve head helps to balance the same. The hood 75 can be mounted in any desiredmanner, but as herein shovfn ismounted on lugs 77 carriedby the val-ve seat 53, these lugs beingl cut or `otherwise formed thereon and then bent up so as to receive thev hood end. As will be seen, the entire exhaust valve mechanism is readilv removable.

-This case is" a division of my co-pendin application Serial. No. 296,358, vfor metho and apparatus for treating engine fuel, filed May 12, 1919. i

I Vhat I claim is:

1. In an internal combustion engine, al

spring closed exhaust valve provided with a hollow stem, an actuating rod in the stem, a lever engaging said actuating rod,'and a rocker engaging said lever at spaced points so as to suddenly vary the leverage during opening of the valve.

2. The combination with a valve stem, of a co-operating lever iorwrnoving the stem,

said lever being fulcrumed at one side andA projecting over said stem, means for actuat-` ing said lever at one point for .moving the valve stem at a slow speed and at another f point for moving the valve .stem more rapidly, said stem being locatedinterinediate said points of lever actuation.

lAv device for actuating internal combustion engine exhaust valves of the poppet type, comprising a pivoted lever adapted to engage the valve,'a second pivoted lever having a plurality oli-spaced bearing means adapted successively to engage said first mentioned' lever, the points oi contact of said respective bearing means being ofspaced points located at successively in;L creasing distance from the pivot of said sec'- ond lever and of successively decreasing' distance from the pivot of first said lever, one of said bearing means comprising a roller, and means 'for rocking second said lever about its pivot.

Signed` at New Bloomfield in the countyT o,Perry and State of Pennsylvania.

WILLIAM HARPER, JR. 

